Related Experiment Video
Updated: Aug 1, 2026
Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of Phosphorus(I)
Published on: November 22, 2016
"Breaking the Rules": A Planar Phosphonium Cation.
Scientists synthesized a novel square-planar phosphonium ion, challenging established chemical principles. This discovery provides key exceptions to the van
Area of Science:
- Inorganic Chemistry
- Organic Chemistry
- Fundamental Science
Background:
- Established chemical principles, such as the van't Hoff - Le Bel rules, dictate molecular geometry.
- Understanding molecular structure is crucial for predicting chemical behavior and reactivity.
Purpose of the Study:
- To challenge long-standing scientific tenets by synthesizing and characterizing novel compounds.
- To explore exceptions to established rules in chemical bonding and structure.
Main Methods:
- Synthesis of planar-tetracoordinate compounds.
- Characterization of the synthesized phosphonium ion using spectroscopic and crystallographic techniques.
Main Results:
- Successful synthesis of a square-planar phosphonium ion (compound 1).
- Demonstration that compound 1 represents an exception to the van't Hoff - Le Bel rules.
Conclusions:
- The synthesis of planar-tetracoordinate compounds necessitates a re-evaluation of fundamental chemical principles.
- This work expands the understanding of bonding and geometry in chemical compounds.
More Related Videos
10:52Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
Published on: July 27, 2022
07:14Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
Published on: May 12, 2023
Related Concept Videos
02:52VSEPR Theory and the Basic Shapes
02:27Predicting Molecular Geometry
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
02:30Chirality at Nitrogen, Phosphorus, and Sulfur
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
01:34Woodward–Hoffmann Selection Rules and Microscopic Reversibility
01:08Hückel's Rule Diagram of π MOs: Frost Circle
A Frost circle is constructed by drawing a polygon whose number of edges is equal to the number of carbons of the given cyclic system, with one of the vertices pointing down. Then, a circle is drawn enclosing the polygon so that...